Type-writer.



- No. 732,498. PATENTED mmso, 1903.

N. L. ANDERSON.

TYPE WRITER.

' APPLICATION FILED MAY 10, 1902. H0 IODEL. 2 SHEETS-SHEET 1.

1/91 lineage 4%? Nil PATENTED JUNE 30, 1903. N. L. ANDERSON.

v TYPE WRITER.

APPLIOATIQN FILED MAY 10. 1902.

' 2 SHEETS-SHEET 2.

N0 MODEL.

l luueu Fox :tric starter.

U ITED STATES Patented June so, 1903.

PATENT OFFICEO TYPE-WRITER.

$EECIFICATION formingpart of Letters Patent No. 732,498, dated June 30,1903.

Application filed May 10,1902. Serial No. 106,802. (No model.) I

To all whom it may concern:

Be it known that I,:NEAL LARKIN ANDER- SON, acitizen of the UnitedStates,-residing at Montgomery, in thecounty of Montgomery,

Stateof Alabama, have invented certain new. and useful Improvements inType-Writing The object of my present invention is to greatly simplifythe-structure and lessen the cost of the manufacture of the machine,while still preserving the characteristic and general mode of operationof the former invention, and especially to modify the construction of vthe automatic electric switch, to provide an automatic starter for theelectric motor, and to provide different degrees of torque for saidmotor corresponding to the tension of the return-spring. V I

In the accompanying drawings, Figure 1 represents a side elevation ofthe motor and return-spring mechanism, shown asa separate structure, tobe applied to any typewriter. a Fig. 2 is a rear elevation showingcertain details. Fig. 3 is a frontelevation of the same, showingasimplified automatic electric switch and simplified structure of thereturn-spring mechanism and an automatic electric starting mechanism forthe electric motor. Fig. 4 is a cross-section of the side elevation,showing certain details of the automatic switch. Fig. 5 shows a detailof the hand-lever switch in the base of the motor and means for changingthe speed of the electric motor and insuring the prompt starting of themotor by means of the automatic elec- Fig. 6 is a transverse sectionthrough a type-writer of the Remington type with my invention appliedthereto. Fig. 7 shows a modification of the mechanism for ing or frame.a shaft suitably journaled in a bracket mountchanging the motor-speedafter the motor has started.

Referring tothe drawings, A represents the frame'of the small electricmotor mounted as described in my. Letters Patent No. 695,779. It shouldbe noted that inasmuch as gear A is mounted on armature-shaft A and gearA on the shaft of the return-spring mechanism I have done away with theuse of the gear cas- Gears a and a are mounted on ed on the face of thecasing of the electric motor. The mounting of the return-spring and thecam and pulley mechanism for effecting the return of the carriage andthe automatic release of the return-spring are the same in structure andoperation as in my former patent, except that in place of the spur-gearO, with its accompanying pinion and ratchet,I have substituted a ratchet0, thus simplifying the structure and lessening the cost of the device.Normally engaging the ratchet-wheel O is a pawl F formed on lever F,which in turn is mounted on a projection of the motorcasing A by meansof a pivot. This lever F, which constitutes the starting and stoppingdevice for the spring-drum and, secondarily, for the electric motor, asin my former patent, is connected atone end to the link K and isprovided with a pin F adapted to engage a slot in lever I, to beexplained later on. A

spring F normally presses F and forces F into engagement with the teethof the ratchet C. An L-shap'ed locking-arm I cooperates with the pawlFand is pivot-ally mounted on a projection of the motor-casing A and isacted upon by a flat spring 1 secured to the casing at I, which tends toforce the said arm I against the pin F Secured within the outerperiphery of cam D by a suitable pin is let into the inner periphery ofthis ring V3,

and a short distance beyond this is a smaller fiber block W. The fiberdisk U, with brass hub and bushing, is mounted on shaft B by a set-screwU Fastened to the outer surface of this disk and insulated therefrom isa thin brass ring U. On the outer edge of disk U, perforating itsinterior, is a hole in which works a brass pin X. Around this is a lightcoiled spring X pressing said pin outward into constant contact with theinner periphery of ring V Pin X is also in metallic contact with theunder surface of the brass ring U.

The circuit for supplying current to the electric motor leads from oneside of a suitable battery ormain to a binding-post on the motor a,thence to a copper brush WV fastened to the motor-casing, but insulatedtherefrom. This brush is in constant contact with ring V W is a copperbrush fastened also to the motor-casing and similarly insulatedtherefrom and in constant contact with the brass ring U on the fiberdisk U. From this brush W run-s a wire to the field of the motor. Thuswhen the electric motor is at rest the pin Xisin contact with the fiberW on the ring V and the current from the main to the motor is broken.

The operation of the carriage-return mechanism, cams, pulley, 850., isin all respects similar to that of Letters Patent, March 18, 1902, No.695,779.

I will now describe the operation of the simplified structure of lever Fand the automatic switch mechanism.

While the line is being written, 0 islocked by means of the pawl F onlever F. IVhen, however, it is desired to return the carriage to thebeginning of the new line, the operator strikes the return-key, which bymeans of the link K pulls down the lever F, releases pawl F fromengagement with the ratchet C, and allows the return-spring C to rotategear 0 and cam-ring D. The rotation of said ring D causes the cam-teethd to ride up the incline of teeth (1 on ring D and forces said ringtoward the pulley D When the clutchteeth (1 and 01 come into engagement,pulley D is carried around with the springdrum, winding up the band Nand reversing the carriage, and thereby restoring the tension of themain spring, which advances the carriage, as in my former patentreferred to. As lever F is pulled down by link K it forces back thelock-arm I until pin F has reached the slot I when under pressure ofspring I this slot I locks lever F in position shown, Fig. 3, holdingpawl F out of engagement with ratchet G. Then the ratchet O is thusreleased by link K, the spring-drum and ratchet attached to same beginto revolve, and thereby pin X is advanced beyond the fiber W and isbrought into metallic contact with brass ring V thus closing the circuitthrough the electric motor. When the carriage reaches its initialposition, the trip H engages pin 1 on lever I and rocks said lever torelease the lever F, which by means of pawl F again engages. ratchet 0,thus stopping the spring-motor and releasing pulley D from engagementwith the cam D, as in my former patent referred to. The electric motorcontinues to revolve shaft B and fiber disk U, attached thereto, untilpin X comes into contact with the short fiber block W, when the circuitis broken for an instant. The momentum of the motor, however, causesshaft B to carry pin X past the fiber block W, and the circuit is againclosed, and motor drives shaft B until pin X reaches fiber block W, whenthe circuit is again opened, and the electric motor having had itsmomentum already checked by fiber W now comes to rest.

It sometimes happens that it is desirable to change the speed of themotor to correspond to variation of the voltage of the current on themain. This is accomplished by means of a coil of German-silver wire orother resistance mounted in the base of the motor, Fig. 5. One wire fromthe main S goes to the resistance-coil and after a few turns of theresistance-coil has a branch wire S soldered to it.

S S S are branch wires soldered to the coils of resistance-wire withrelatively morewindings each, so that the current has its greatestresistance when it has passed to the motor through S and relatively lessfrom S S S An ordinary hand-switch is set in the base of the motor, asshown in Figs. 1 and 5. One end of the switch is pivoted at S and isconnected to the wire S leading to the commutator. Comparing Figs. 3and5, it is evident that when the switch is thrown so as to unite S and Sthe current has least resistance from the coil. By throwing the switchsuccessively to points S, S and S the resistance is increased, and themotor runs at relatively less speed.

In using current from an alternating-circuit main it is sometimesdesirable that the motor should start more promptly and with greatertorque than would be derived from the normal strength of the current towhich the switch has been set. I have consequently provided a smallautomatic electric starting mechanism, by means of which a very strongcurrent is thrown through the motor during the time the carriage isbeing returned to the beginning of the new line and is thenautomatically cut out, leaving the motor to continue its revolutionsunder the normal strength of current to which the switch is set.

The wire S is soldered to the resistance-wire of the coil after a fewturns have been made around the coil, or, if desired, it may be solderedto the wire from the main before it enters the coil at all. This wire Sruns to an insulated brush S on lever F, Fig. 5, and another wire Sconnects with the motor through the base of switch S and runs to thebrush S insulated on the motor-casing at S It is obvious that when thekey-lever pulls down the lever F brushes S and S are in contact and thestrongest current passes through the motor until the carriage reachesits initial position, when the trip H strikes t'helever-arm I, releasinglever F, thus breaking the contact-points S and S and leaving the motorto continue its revolutions with the normal strength of the current towhich the switch S is set. ing the contacts between S and S, as shown,is due to the fact that if the strongest currentwere left on during theentire time the electric motor is in circuit said motor would acquiresuch momentum as to carry pin X beyond both fiber blocks W and W, thusoverwinding the return-spring. induction-motor is used, S and S may beconnected with the commutator in such a way that the motor will startunder full torque as a series motor, when the contacts 5 and S arebroken and will continue its windings under reduced torque asaninduction-motor, when said contacts are closed, as illustrated in Fig.7, in.which the wires from S and S are connected to the respective wiresentering and leaving the motor-commutator, shortcircuiting themotor-armature when contacts S and S are closed, thereby converting saidmotor into an induction-motor. When the pawl-lever F is disengaged fromthe springmotor during the return of the carriage, contacts S and S aredisengaged, and the motor starts as a series motor under an increasedtorque, which is reduced when the armature is short-circnited bycontacts S and S, as above described.

It is to be noted that both forms of the mechanism for determining theinitial and final speeds of the motor comprise a relativelylowresistancecircuit subsidiary to the main motor-circuit controlled by means of thecont acts S and S and releasing-lever F, that in the first instancedepending upon the closure of a low-resistance path in the motor-circuitby way of said contacts to permit an abnormal current to flow throughthe motor and develop an abnormal starting torque in said motor and thatin the modified form depending upon the establishment of a lowresistancecircuit or short circuit for the m0- tor-armature by way of contacts Sand 8, thereby converting said motor into an induction-motor, having arelatively reduced torque for a given current-fiow.

What I claim is 1. A type-writer, having a paper-carriage, means forimpelling the carriage in its advance movement, a spring-motor forimpelling said carriage in the opposite direction, a pulley-wheelconnected with the carriage, cam-rims, on said pulley and saidspringmotor respectively, a ring intermediate of said pulley and saidmotor and provided with cams cooperating with the respective cam-rims onthe pulley and motor, said mechanism being adapted to connect saidcarriage The necessity for break- 7 When an,

starting and stopping the spring-motor, said means comprising a ratchetfastened to the spring-drum, a cooperating pawl-lever engaging saidratchet-teeth and holding said spring-drum normally inoperative, akey-actuating lever releasing said pawl from engagement with saidratchet, a locking-lever, locking said pawl out of engagement with saidratchet during the return movement of the carriage, and a trip fastenedto the pulley, said trip being in line with a pin on the locking-leverand adapted to release said pawl from the rocking arm, and permit itagain to engage the said ratchet when the beginning of the line has beenreached.

2. A type-writer having a paper-carriage, means for impelling saidcarriage in its advance movement, a spring-motor for impelling thecarriage in the opposite direction, an auxiliary electric motor, withmeans for starting and stopping said electric motor, comprising twocircuit-terminal brushes, an

insulated metal disk fastened to the shaft'of,

the return-spring motor, said disk being in constant electric contactwith one of said terminal brushes, and a ring surrounding said disk andfastened to the spring-drum of said return-spring, said ring being inconstant electric contact with the other brush of said terminals, withmeans for automatically making and breaking electric circuit betweensaid ring and disk.

3. A type-writer having a paper-carriage, means for impelling saidcarriage in its advance movement, a spring-motor for impelling thecarriage in the opposite direction, an auxiliary electric motor forstoring energy in said spring-motor, and with means for starting andstopping said electric motor, comprising two circuit-terminal brushesfastened to a stationary part of the apparatus, an'insulated metal diskfastened adjustably upon the shaft of the returnspring motor, said diskbeing in constant contact with one of said terminal brushes, a ringsurrounding said disk, fastened to the spring-drum of saidreturn-spring, said ring being in constant contact with the other brushof said terminals, with means for automatically making and breaking theelectric circuit between said ring and disk, said means consisting of aconductor on said disk, engaging the inner periphery of said ring, andadapted to make electrical connection between said terminals forstopping the same, by first checking the momentum of the electric motor,then bringing said electric motor to a final stop.

5. A type-writer having a paper-carriage,

a spring-motor for impelling the carriage in means for starting saidelectric motor, and

means for stopping the same by first opening the circuit for an instant,thereby checking the momentum of said electric motor, then closing thecircuit, and again automatically opening the same for a longer period,Whereby the electric motor comes finally to a stop.

6. A type-writer having a paper'carriage, a spring-motor for impellingthe carriage in its advance movement, a spring-motor for impelling thecarriage in the opposite direction, an auxiliary electric motor forstoring energy in said spring-motor, means for automatically startingsaid electric motor, and means for first checking the momentum and thenbringing said electric motor to rest, said means consisting of twoinsulating-pieces of diiferent lengths within the inner periphery of theinsulated ring fastened to the returnspring motor, and in line with therevolution of a spring-pressed conductor working within the outerperiphery of and in electric contact with an insulated disk fastened tothe shaft of said return-spring, whereby the momentum of said electricmotor is first checked when the said conductor comes into contact withthe shorter of theinsulating-pieces, and afterward the motor continuesits winding until the said conductor comes into contact with thelongerof theinsulating-pieces, when the current is again out out and the motorfinally comes to rest.

7. A type-writer having a paper-carriage, a spring-motor for impellingsaid carriage in its advance movement, a spring-motor for impelling thecarriage in the opposite direcan abnormal torque and automatically reducing said abnormal torque, thereby leaving the motor to continue itswindings under the energy of the reduced torque.

8. A type-writer having a paper-carriage, a spring for impelling thecarriage in its advance movement, a spring-motor for impelling thecarriage in the opposite direction, an auxiliary electric motor adaptedto restore the energy of the said return-spring, a cooperatingpawl-lever adapted to release said spring-motor, a locking-arm holdingsaid pawl-lever out of contact with said springmotor during the returnof the carriage, a trip adapted to release said pawl from saidlocking-arm when the carriage has returned to the beginning of the newline, means for starting said electric motor under an abnormal torque,and means for automatically reducing said abnormal torque leaving themotor to continue its winding under the normal torque after the motorhas been started, said means consisting of a circuit-breaker actuated bysaid pawl-lever controlling a relatively low-resistance circuitsubsidiary to the main motor-circuit.

9. A type-Writer having a paper-carriage, a spring for impelling saidcarriage in its advance movement, a spring-motor for returning thecarriage to the beginning of the line, an auxiliary electric motor forrestoring energy to said spring-motor, and a switch in the base of saidmotor, whereby through different resistances the strength of the currentsupplied to the motor may be changed at the will of the operator.

In testimony whereof I afiix my signature in the presence of twowitnesses.

NEAL LARKIN ANDERSON. Vitnesses:

W. R. MCDADE, B. GASTON.

